I am having trouble understanding how rand function is operating here.Can you comment the process?

Question

// Created by ANIK

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

float sumline( float arr[ 12 ][ 12 ], int L1 )
{
float sum = 0;
for ( int i = 0; i < 12; i++ )
{
sum += arr[ L1 ][ i ];
}
return sum;
}

float averageline( float arr1[ 12 ][ 12 ], int L2 )
{
return sumline( arr1, L2 ) / 12.0f;
}

int main()
{
srand( ( unsigned )time( NULL ) );
float array[ 12 ][ 12 ], rf = 5.0f;

for ( int i = 0; i < 12; i++ )
{
// ** float sum_this_row = 0.0f;
for ( int j = 0; j < 12; j++ )
{
// scanf( "%f", &array[ i ][ j ] );
array[ i ][ j ] = ( float )rand( ) / ( float )( RAND_MAX * rf );
// ** sum_this_row += array[ i ][ j ];
// ** printf( "%.1f ", array[ i ][ j ] );
}
// ** printf( "=> %f", sum_this_row );
// ** putchar( 10 );
}

int line;
scanf( "%d", &line );
// fflush( stdin );

char choose;
scanf( " %c", &choose );
// fflush( stdin );
if ( choose == 'S' )
{
printf( "%f", sumline( array, line ) );
}
else if ( choose == 'A' )
{
printf( "%f", averageline( array, line ) );
}
return 0;
}

Answer 1

If you LINK your code, people will find it easier to read